n-Butane isomerization on solid superacids

Yori, Juan Carlos; Luy, J.C.; Parera, J.M.

doi:10.1016/0920-5861(89)80013-6

Cited by 40 publications

(43 citation statements)

References 11 publications

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“…Zirconium hydroxide, Zr(OH) 4 , was obtained by hydrolysis and precipitation of zirconium oxychloride (Strem, 99.9998%) [17]. To obtain zirconia, ZrO 2 , Zr(OH) 4 was calcined at 620°C for 3 h in flowing air (10 mL min )1 ).…”

Section: Catalysts Preparationmentioning

confidence: 99%

Comparison between Ni and Pt promoted SO42??ZrO2 catalysts for n-octane hydroisomerization-cracking

et al. 2005

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The production of C 4 -C 6 branched isoalkanes by isomerization-cracking of n-octane (300°C, 0.1 MPa) using sulfated zirconia catalysts was studied. The effect of Ni addition on the activity and selectivity was compared to the effect of Pt. Pt enhanced the activity and stability of the catalysts. Ni mainly improved the selectivity to isoparaffins (maximum yield at 1% Ni). n-Octane conversion fully correlated with total acidity. Average and final stable conversion values were in comparison lower for Ni catalysts. This result was addressed to the lower metal activity of Ni and to the detrimental effect of sulfated zirconia on the reducibility of the metal.

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Section: Catalysts Preparationmentioning

confidence: 99%

Comparison between Ni and Pt promoted SO42??ZrO2 catalysts for n-octane hydroisomerization-cracking

et al. 2005

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“…Considering the experimental error, the mean pore diameter remained around 50.6 Å and with a standard deviation of 2.16 Å , independently on the amount of Pt loaded. Figure 1 shows the X-ray diffraction patterns of the studied catalysts after their calcinations at 948 K. The peak at 2h=40°corresponds to platinum as indicated elsewhere [5] and its intensity increases according to the amount of metal added to the catalyst. The diffraction peaks at 2h=45.5°and 66°correspond to c-alumina and, they are weak as an indication of its amorphous structure.…”

Section: Catalytic Activity Evaluationmentioning

confidence: 98%

“…Nonetheless, the reaction mechanism is still considered monofunctional, since no increase of the catalysts activity was observed for the n-butane isomerization in the presence of the metallic phase [5]. Moreover, the amounts of Lewis and Bro¨nsted acid sites determined by infrared spectroscopy are apparently independent of the Pt loading [8].…”

Section: Introductionmentioning

confidence: 96%

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Effect of Pt Incorporation into Ni/ZrO2–SO4=/Al2O3 Catalyst for n-Butane Isomerization

et al. 2006

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Three Ni/ZrO 2 -SO 4 = /Al 2 O 3 catalysts with different concentrations of platinum (0.2, 0.3 and 0.4 wt%) were prepare and tested for n-butane isomerization reaction at 338 K, in absence and in presence of hydrogen. The results shown that, at low temperature, platinum contributes to the olefin or butyl ion formation and the reaction follows a bimolecular pathway. However, when the reaction occurs in the presence of hydrogen, the formation of butyl ions is inhibited. The main feature of platinum addition is the stabilization of the catalytic activity, which is indicated by the slow deactivation constants compared to that of the unpromoted catalyst.KEY WORDS: n-butane isomerization; Pt catalyst; Ni/ZrO 2 -SO 4 = /Al 2 O 3 catalyst.

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“…Considering the adsorption of anions as being purely electrostatic (in all preparations the pH of the impregnating solution was lower than the isoelectric point of Zr(OH) [4][5][6][7])the amount of the W surface species needed to form a monolayer, e.g. by reacting with all the available OH groups, varies with the adsorbed species ( Table 2).…”

Section: Introductionmentioning

confidence: 99%